.pic{
	width: 520px;
	position: relative;
	margin: 0 auto;
}
.pic button{
	width: 20px;
	height: 30px;
	border: none;
	background-color: rgba(0,0,0,0.3);
	color: #fff;
	position: absolute;
	top: 50%;
	margin-top: -15px;
	display: none;
}
.pic:hover button{
	display: block;
	cursor: pointer;
}
.pic button.leftBtn{
	border-radius: 0 15px 15px 0;
	left: 0;
}
.pic button.rightBtn{
	border-radius: 15px 0 0 15px;
	right: 0;
}
.pic .circle{
	background-color: rgba(255,255,255,0.3);
	padding: 3px 0;
	border-radius: 10px;
	position: absolute;
	left: 50%;
	bottom: 15px;
	font-size: 0;
	margin-left: -35px;
}
.pic .circle span{
	float: left;
	width: 8px;
	height: 8px;
	background-color: #FFFFFF;
	border-radius: 50%;
	margin: 0 3px;
	cursor: pointer;
}
.pic .circle span.active{
	background-color: #f50;
}
